Show an error with recommendations on how to fix for clashing aliases

[stephenafamo]

When aliases clash, the generated code will be invalid.

Bob should show an error along with recommendations (manual aliasing) on how to fix.

The cases to look out for are:

• Any duplicates in both UpSingular and UpPlural for all tables. To be clear, every entry should be unique across both lists.
• Any duplicates in both DownSingular and DownPlural for all tables. To be clear, every entry should be unique across both lists.
• Duplicates in the column aliases for each table.
• Duplicates in the relationship aliases for each table.